Jennifer Garneris celebratingBen AffleckonFather’s Day.

The actress, 46, shared a sepia-filtered photo of her ex-husband, 45, on Instagram Sunday with a sweet shout-out about his parenting. “Our kids are lucky to have a dad who looks at them the way you look at them and loves them the way you love them, @benaffleck. #happyfathersday #threeluckykids #haveagreatday,” Garner wrote.

Earlier this week, Affleck celebrated his 12-year-old daughter Violet’s school graduation at Ivy at the Shore in Santa Monica. He and Garner are also parents to 9-year-old daughter Seraphina and 6-year-old son Samuel.

The famous duoseparated in 2015andfiled for divorcelast year, but have maintained an amicable relationship for the sake of their children.

“The kids love when they all spend time together,” a source told PEOPLE. “As long as Ben keeps working on himself, Jen is happy. She will continue to support him because it benefits the kids.”

“I can think of three incredible reasons why today is so special. Happy Father’s Day to all the dads and father figures out there, and to the women that empower them to be the best they can be. We are all so fortunate beyond measure,” he captioned the picture.

Garner also paid tribute to her own father William on Instagram Sunday, also mentioning her sisters.

“Hey Dad, Melissa, Susannah and I know how lucky we are to be yours. We love you, Dad, and can’t wait to see you SOON! #happyfathersday #threeluckygirls #haveagreatday,” Jennifer captioned thephotoof her and her dad.

David Fisher/Rex USA

EE British Academy Film Awards, Winners, Royal Opera House, London, Britain - 10th February 2013

Affleck’s Father’s Day holiday comes after recently wrapping his filmTriple Frontierin Hawaii, wherehe threw the film’s cast and crew a traditional Hawaiian luau.

Around 500 people enjoyed the celebration, which included a full roasted pig pit at the venue. Entertainment included fire dancers, as well as a three-piece Hawaiian band, and Affleck provided shuttle service for all of the cast and crew.

“Ben has been planning this luau for weeks,” a source told PEOPLE at the time. “He wanted to do it for everyone as the shoot has been rough with 14 days of rain and training.”

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Affleck’s girlfriend,Saturday Night LiveproducerLindsay Shookus, also visited him on set, with thetwo spotted holding handsin Honolulu in March.

A source previously told PEOPLE that Affleck and the producer, 37, are “very much still together.” Another source said the couple is “not rushing anything,” but that they “enjoy each other’s company” and “are in a committed relationship.”

Affleck and Shookus firststepped out publicly as a couplein July.

source: people.com